Fix http -> https [ci skip]

README.md

@@ -71,7 +71,7 @@ and may also be used independently outside Rails.
     * [Getting Started with Rails](http://guides.rubyonrails.org/getting_started.html)
     * [Ruby on Rails Guides](http://guides.rubyonrails.org)
     * [The API Documentation](http://api.rubyonrails.org)
-    * [Ruby on Rails Tutorial](http://www.railstutorial.org/book)
+    * [Ruby on Rails Tutorial](https://www.railstutorial.org/book)
 
 ## Contributing
 

railties/RDOC_MAIN.rdoc

@@ -57,7 +57,7 @@ can read more about Action Pack in its {README}[link:files/actionpack/README_rdo
 
 * The \README file created within your application.
 * {Getting Started with \Rails}[http://guides.rubyonrails.org/getting_started.html].
-* {Ruby on \Rails Tutorial}[http://www.railstutorial.org/book].
+* {Ruby on \Rails Tutorial}[https://www.railstutorial.org/book].
 * {Ruby on \Rails Guides}[http://guides.rubyonrails.org].
 * {The API Documentation}[http://api.rubyonrails.org].